Lara Logan was scheduled to deliver a report on Sunday’s “60 Minutes” about disabled veterans who climb mountains. Instead, she appeared in front of the newsmagazine’s trademark black backdrop and issued an apology.

Ms. Logan said that Dylan Davies, one of the main sources for a two-week-old piece about the attack on the American diplomatic mission in Benghazi, Libya, had misled the program’s staff when he gave an account of rushing to the compound the night the attack took place. “It was a mistake to include him in our report. For that, we are very sorry,” Ms. Logan said.

The apology lasted only 90 seconds and revealed nothing new about why CBS had trusted Mr. Davies, who appeared on the program under the pseudonym Morgan Jones. Off-camera, CBS executives were left to wonder how viewers would react to the exceptionally rare correction.

While veteran television journalists spent the weekend debating whether the now-discredited Benghazi report would cause long-term damage to the esteemed newsmagazine’s brand, some media critics joined the liberal advocacy group Media Matters for America in calling for CBS to initiate an independent investigation of missteps in the reporting process.

But the CBS News chairman, Jeff Fager, who is also the executive producer of “60 Minutes,” has not ordered an investigation, and on Sunday a spokesman indicated that the program was going to let its televised apology be its last word on the issue.

“Aside from the fact that it struck a very passive tone and pushed the responsibility onto the source, Dylan Davies, it said nothing about how the show failed to properly vet the story of an admitted liar,” Mr. Silverman said in an email. “There are basic questions left unanswered about how the program checked out what Davies told them, and where this process failed.”

“In the short term, this will confirm the worst suspicions of people who don’t trust CBS News,” said Paul Friedman, CBS’s executive vice president for news until 2011. “In the long term, a lot will depend on how tough and transparent CBS can be in finding out how this happened — especially when there were not the kind of tight deadline pressures that sometimes result in errors.”

Ms. Logan has said that a year of reporting informed the Oct. 27 piece, which was Mr. Davies’s first interview. Some of Ms. Logan’s conclusions still hold up to scrutiny — for example, that “contrary to the White House’s public statements, which were still being made a full week later, it’s now well established that the Americans were attacked by Al Qaeda in a well-planned assault.”

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CBS said it was “a mistake” to broadcast statements by Dylan Davies, a security contractor.Credit
CBS

But enough doubts have been sown about Mr. Davies’ account of being an eyewitness that CBS apologized on Friday, scrubbed the report from its site (and the “60 Minutes” Twitter feed) and prepared Ms. Logan’s on-camera statement Sunday. (Mr. Davies’s account included him hitting an Al Qaeda fighter in the face with the butt of a rifle and seeing the dead ambassador, J. Christopher Stevens, at a hospital.)

Parallels have been drawn between this case and CBS’s flawed 2004 report on President George W. Bush’s time in the National Guard. Each time, the news division adopted a defensive crouch when advocates first started to question the stories. But the political backdrop has changed significantly this time. In 2004, there were accusations of “liberal bias” and unrelenting coverage of the controversy on conservative websites, driven by the right’s long animus toward Dan Rather, the correspondent on the Bush report, and the implication that he was trying to hurt the president’s re-election chances.

This time, conservatives initially trumpeted the “60 Minutes” report: the morning after it was broadcast, Senator Lindsey Graham, Republican of South Carolina, said on Fox News that he planned to block all administration nominations until Congress was granted access to all of the survivors of the attack. (On Sunday, Mr. Graham stood by his threat despite CBS’s retraction.) At the same time, questions about Mr. Davies and his account were immediately raised, by both liberal activists and independent reporters.

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Media Matters, which has sought to defend the Obama administration from what it calls the “Benghazi hoax” promoted by conservative media, noticed an early red flag on Oct. 28, when a Fox News correspondent said that Mr. Davies had asked to be paid for a previous interview. (Fox News declined to pay, but has acknowledged using him as a source; Fox says it stands by its reporting on Benghazi.) At Media Matters, the “60 Minutes” report became “Priority No. 1, 2 and 3,” said Bradley Beychok, the group’s president.

As advocates and journalists pressed CBS, the network showed scant interest in re-reporting the issue. Ms. Logan repeatedly vouched for Mr. Davies, saying in an interview last week that she had full confidence in him, even after the veracity of his account had been challenged by a conflicting report presented to the State Department by his employer.

Ms. Logan’s confidence clearly influenced her bosses; so did a pervasive belief inside CBS News that administration officials were trying to undermine Mr. Davies and, by extension, the entire “60 Minutes” report. CBS’s retraction came only after the network confirmed a New York Times report in which government officials said that Mr. Davies gave a different account of events to the F.B.I. than he gave to CBS.

Overall, cries of “conservative bias” are not nearly as resonant as cries of “liberal bias” were in 2004, and conservative media outlets have largely ignored the CBS retraction in recent days. For those reasons, among others, “60 Minutes” is unlikely to take as severe a hit as “60 Minutes II,” the spinoff program that showed Mr. Rather’s National Guard report, took in 2004.

Over the weekend, CBS staff members expressed confidence that the damage to “60 Minutes,” while certainly the worst it has had to endure in the decade since Mr. Fager succeeded Don Hewitt as the show’s executive producer, would not be enduring. One reason is the deep reserve of good will the program has built up both with viewers and in journalistic circles. But the staff members also agreed that the program would be helped by that absence of a cause to inflame right-wing media voices, as well as by the belated effort to apologize.

A more specific and perhaps more serious problem, said one staff member with a long tenure on the program, who asked not to be identified offering an internal analysis of the report’s impact, was the damage done to the reputation of the report’s correspondent, Ms. Logan.

A youthful star of a newsmagazine with few other young faces, whose previous work has earned accolades from Mr. Fager, she is now the public face of what Mr. Fager called “as big a mistake” as “60 Minutes” has made in its 45-year history. Critics of the Benghazi report have accused Ms. Logan and her producers of having a conservative bias; as evidence, some have pointed to an October 2012 speech by Ms. Logan that called in passionate terms for American revenge after the Benghazi attack.

The episode has also drawn attention to the unusual autonomy that “60 Minutes” enjoys within CBS — and given ammunition to those inside the network who believe the newsmagazine should not be so detached from the rest of the news division. One longtime layer of oversight — a senior executive in charge of standards who screened every “60” report before broadcast — was removed after Mr. Fager was promoted to chairman of the news division.

Correction: November 11, 2013

Because of an editing error, an earlier version of this article misidentified the person who said, “In the short term, this will confirm the worst suspicions of people who don’t trust CBS News.” The comment was by Paul Friedman, a former CBS executive — not by Craig Silverman, of the blog Regret the Error.

Emmarie Huetteman contributed reporting.

A version of this article appears in print on November 11, 2013, on Page B1 of the New York edition with the headline: ‘60 Minutes’ Airs Apology On Benghazi Reporting. Order Reprints|Today's Paper|Subscribe